Study settings The rural settlement of Hala (population ~ 200,000), located about 200 km north-east of Karachi, Pakistan would be the selected study site, as a high proportion of at-risk under 5 children reside in the area. The large proportion of this population falls in the lower socioeconomic group, according to a recently conducted census in 2008, making the site eminently suitable to test out the trial hypotheses.